Sanitary mixing valve



FIG. 1 is a side perspective view of a sanitary mixing valve showing my new design;

FIG. 2 is a side elevation view thereof, the opposite side being a mirror image;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a rear elevation view thereof. 

The ornamental design for a sanitary mixing valve, as shown and described. 